Marine type draft adjuster



Sept. 12, 1950 A. J. WARD MARINE TYPE DRAFT ADJUSTER Filed June 28, 1945gwumm ARTHUR J. WARD CLOTH SLEEVE Patented Sept. 12, 1950 MARINE TYPEDRAFT ADJUSTER Arthur J. Ward, Washington, D. 0.

Application June 28, 1945, Serial No. 602,142 s claim's. (01. 236-45).

(Granted under the act of March a, 1883, as

amended April 30, 1928; 370 O. G. 757) This invention relates to amarine type draft adjuster with automatically self-adjusting parts. Thepresent improvement will be described in connection with conventionaloil burning galley range and bake oven assemblies aboard ship. Itprovides a means for maintaining a predeterterference by either thepitch or roll of the vessel. It permits response to pressures and operating conditionsin substantially the same man ner as in a shoreinstallation.

mined draft regardless of inside and outside pressures on the adjusteror of the ships pitching and rolling motions. As will be understood,pitch refers to longitudinal rising and falling motion of vesselswhereas roll refers to the transverse motions. The outside pressures onthe adjuster damper will of course be changed by the opening of galleydoors and the like and the damper respondsautomatically to thesechanges.

Prior draft adjusters, while reasonably satisfactory for shoreinstallations, are all characterized by being adversely affected by theships motion. For example, in rough weather a ship may roll 45 and more.Under these conditions the pressure responsive dampers of prioradjusters will swing in response to motion as well as pressure, andhence give a fluctuating draft. This renders the usual pressurecalibration completely inaccurate and ineffective.

The present invention overcomes these difficulties by constantlymaintaining the predetermined amount of draft. This result isaccomplished by a system of pivots, counter weights and anti-frictionbearings. The device includes a cylindrical member for making astovepipe connection with the conventional smokepipe. A pair of bracketsextend longitudinally of the member and provide pivots for the adjusterunit. The body or housing v of the unit is counterweighted on the pivotsregardless of the ships motion. A flexible flameproof or fireprooffabric covers the portion between the unit and the cylindricalconnection to permit response to the action of the counterweight.

The adjuster body is conveniently a sheet metal housing and contains acounterweighted draft adjusting damper which is calibrated in a knownmanner. In short, the position and size of the weight determines thedamper opening and the efiective draft pressure. The damper is pivotallymounted at opposite sides in the novel weighted frame member which rideson a ball or roller bearing race.

The combination of the anti-friction bearings and weights insures aposition substantially vertical to the earths center at all times. Itwill be seen that this construction avoids irregular bearing pressureson the damper pivots and maintains the calibration of the damper withoutin- An object of the invention is to provide a marine type draftadjuster unit which will be self compensating for the pitch and roll ofa vessel..

Another object is to provide a draft adjuster. with a system of pivots,weights and anti-friction. bearings which will maintain the adjusterdamper" support in vertical position during, a rough sea. These andother objects of invention will be manifest from a consideration of thefollowing description, claims and drawings in which:

Fig. 1 is a schematic view of a galley bake. oven and range assemblyincluding theimproved unit joined to the smokepipe.

Fig. 2 is a side elevation of the improved aha;

Fig. 3 is a front view of the improved unit.v I

Referring to the drawing, Fig. 1 shows galley ranges II), II and bakeoven 12, all conventionally connected to smokepipe I3. The improveddraft control adjuster is attached at one end of the.

smokepipe l3 as shown. It consists of a cylindrical connection member Mon which brackets 15 and I6 are secured asby rivets IT. The brackets l5and I6 carry pintles as at 18 on whichthe draft adjuster housing pivots.A fireproof or fiameproof fabric 2! cemented and riveted to member l4and housing 20 provides a flexible draft passage. The fabric 2| isclosely woven or fabricated and treated to make it substantiallyairproof. A circular member 22, L-shaped in cross section, and ring 23when fitted and secured together maintain the ball bearing race 24 inposition to support the adjuster frame 25 counterweighted at 26. Thecounterweight 26 will always assume the lowermost position regardless ofpitch or roll. Adjuster frame 25 supports pintles 21 and 28 for thecalibrated pressure responsive damper 29 with conventional calibratedweight 30.

The damper housing 2!) is counterweighted at its sides to compensate forthe weight of the damper race and weight. These counterweights 3i and 32are screw threaded on brackets 33 and 35 so as to cause the center ofgravity of the unit to be just below the pivot points l8 and i9. Thiswill permit pivotal movement and cause the adjuster housing to remainupright substantially along the vertical.

It will be seen that I have compensated both for pitch and for roll invessels. The present improvements are obviously adapted for use ontrains, aircraft or other installations subject to similar motions.

This invention may be made or used by or for the Government of theUnited States for governmental purposes without the payment to me of anyroyalties thereon or therefor.

What Iclaimis: j

1. Ina draft adjuster, a; smoke pipe conductor, a circulardamper-housing pivotally mounted on 4 means, a flexible connectionbetween the said connector member and housing, a counterweight on thehousing, an anti-friction race positioned in the housing, a selfadjusting weighted member rotatably mounted on said race and a pressureresponsive draft control member pivotally supported on saidweightedmember.

#7.;In a draitradjusterifor use comazship, a pivoted circular damperhousing, a circular ball said connector, a circular anti-friction racepohearing anti-friction race, a Weighted S j sitioned in that housing,a. self-adjusting weighted member rotatably mounted on saidanti-friction race and a pressure responsive damper member movablysupported on said weightedmember.

2. In a draft adjuster, a smoke pipe connector,

a circular damper housing pivotally mounted on said connector, acircular anti-friction race secured in the housing, a self adjustingweighted member rotatably mounted on said anti-friction race and apressure responsive calibrated damper member pivotally supported on.said weighted member.

3.In a draft adjuster, a smoke pipe connector, a damperhousingpivotallymounted to said Vconnector, said pivoted damper housing havingits center of gravitybelow the, pivot axis, an .antifriction racepositioned in the housing, a self adjusting weighted member rotatablymounted on-said anti-friction. race and a .pr.essure.responsive dampermember pivotall r supported on said weighted member.

'4. In a draft'adjuster, a smokepipe connector member, a'support meanson said'connector member, apivoted damper housing on the support means,'an:anti-friction race secured to thehousi g, a self-adjusting weightedmember rotatably mounted on said race and a pressure responsive draftcontrol membersupported onsaid weighted member.

5. ,In "a draft adjuster, a smokepipe connector membenasupportmeanson'saidcconnector,membe1 ',--a pivoted damper hOliSiIig on thesupport means and'a flexible vconnection'forming an air passagebetweentthe smokepipe connection. memher and thehousing.

"6.In a draftadjuster, a smokepipe connector member, a support means onsaid connector member. apivotejd damperhousing on the .support ingrotatable circular damper frame, a, connector T131138, :a flexiblerair-tight fabric connection, an adjustable counterweight on the pivotedcircular damper "housing and a counterweight on the weightedself-adjusting rotatable circular damper frame to insure the weightedself-adjusting rotatable circular damper frame holding the piv--.otedcalibrated;pressure responsive circular damp- .rer' in Fan.upright- ,or operating position regardless of the pitch or roll of theship.

.8. -In adraft. adjuster, apivotedcircular. damper housing, a circularball bearing antiefriction race, a weighted. selfadjustingrotatablecircular damper iframe, .a .connector pipe, a flexibleairtight 'fabric connection, anadjustable counterweight on the pivotedcirculardamper housing, a counterweight onthe weightedself-adjustingrotatable .circular damperirame and twosupports between the connectorpipe an'dthe pivoted circular damper housin which are rigidly fastenedto the connector pipe .and pivotally fastened to'thepivoted circulardamper housing.

ARTHUR. J. WARD.

REFERENCES CITED The following references are of record in the file .of.this patent:

UNITED STATES PATENTS Number Name Date 1,628,643: Breese '"May'17, 192719471251 Dressler Feb. 13,1934 1,988 539 "Bowersox Jan. 22 19352,276,728 Johnson et a1 "Mar. '17, 1942 FOREIGN PATENTS Number CountryDate 1373;814 Great Britain June 2, 1'932 Certificate of Correction vPatent No. 2,521,764 September 12', 1950 ARTHUR J. WARD It is herebycertified that error appears in the printed specification of the abovenumbered patent requiring correction as follows:

Column 3, line 8, for the Word conductor read connector;

and that the said Letters Patent should be read as corrected above, sothat the same may conform to the record of the case in the PatentOfiice.

Signed and sealed this 28th day of November, A. D. 1950.

THOMAS F. MURPHY,

Assistant Gammz'ssz'oner of Patents,

